Ministry of Coal Industry of the People's Republic of China 1997-12-30 Approval 1998-06-01 implementation 1 Scope This standard specifies the requirements for automatic spray control valve for hydraulic support, test methods, inspection rules, marking, packaging, transportation and storage. This standard applies to coal mine hydraulic support with a variety of automatic spray control valve. 2 Normative references The following standards contain provisions which, through reference in this text, constitute the provisions of this standard. At the time of publication, the editions indicated were valid. All standards will be revised, the parties using this standard should explore the possibility of using the latest version of the standard. GBl91-90 packaging and storage pictorial signs GB / T 6388-86 shipping package receiving and dispatching signs GB / T 13264-91 non-conforming sample rate sampling procedures and sampling tables GB / T14437-93 product quality count once Supervision sampling procedures (applicable to the case of a large total volume) GB / T15482-1995 Product Quality Supervision, a small overall count of a sample test procedures and sampling tables MT 76-83 hydraulic support oil emulsion 3 Definitions This standard uses the following definitions. 3.1 Hydraulic support with automatic spray control valve installed on the coal mine hydraulic support and its corresponding hydraulic pipeline connected to the corresponding handle when the operation of the stent to make the stent action while using the working fluid automatically open Or close the spray waterway device (hereinafter referred to as the control valve). 3.2 Working fluid operating emulsion The control valve is opened or closed and has a certain pressure emulsion. 3.3 Opening pressure opening pressure The minimum pressure required to open the control valve, in MPa. 4 Requirements Control valves shall comply with the provisions of this standard and shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 4.1 Ambient Temperature Ambient temperature 4 ~ 40 ℃ under normal conditions. 4.2 Appearance The appearance of the surface smooth, and should be corrosion protection layer, the protective layer should be uniform, no flaking, no scratches; shell no deformation, cracking, corrosion and mechanical damage; clearly marked water inlet, water outlet and work Liquid into the liquid hole; nameplate installed securely, writing clearly. 4.3 Interface Inlet, outlet and working fluid inlet interface should be quick connector form, interface size and surface roughness should be consistent with this standard Appendix A (standard appendix) requirements, the interface after the test without water seepage, Exudate phenomenon. 4.4 Strength Control Valve fluid rated pressure of 32MPa, 1.5 times the rated working pressure from the control valve into the liquid inlet pressure test, no liquid discharge, the shell and parts do not produce any deformation or damage. 4.5 Loss of resistance When water flows through the control valve at a flow rate of 20 L / min, the pressure difference across the inlet and outlet should not exceed 0.1 MPa. 4.6 open pressure water pressure in the range of 1.0 ~ 7.0MPa, the opening pressure should not exceed 2MPa. 4.7 The use of water pressure in the use of water pressure of 1.0 to 7. oMPa range of test control valve should be able to normally open and close the test process control valve can not be automatically opened or closed phenomenon. 4.8 Service life After 4000 cycles test, the seal shall comply with the provisions of 4.9. 4.9 Sealing Table 1 sealing test method for testing, the test pressure should be no pressure drop. Working fluid rated pressure and the use of water pressure range, after 2h regulator test, the working fluid should not have pressure drop. 5 Test Methods 5.1 Test System Test system shown in Figure 1. 5.2 Test Equipment and Equipment 5.2.1 Pressure Gauge: Range of 0 ~ 1.6MPa and 0 ~ 40MPa two, accuracy of 1.5. 5.2.2 meter: rated pressure ≥ 7.0MPa, rated flow ≥ 30L / min. 5.2.3 stopwatch: ordinary mechanical stopwatch or electronic stopwatch. 5.2.4 spray pump: rated pressure ≥ 7.0MPa, rated flow ≥ 30L / min. 5.2.5 working fluid pump: rated pressure ≥ 32MPa. 5.2.6 valve: hydraulic support with a valve. 5.2.7 Counter: Blood cell meter
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